Item Name: Hydroponics BNC Connector PH Controller PH Electrode Probe Electrode ph Meter. Response Time: 1min Zero-point: 7 +- 0.5PH Measurement range: 0.00~14.00 PH Operating Temperature: 0-60C Internal Resistance: 250M Alkali Error: 0.2PH Cable length: Approx. 70cm Terminal Blocks: BNC plug Theoretical Percentage Slope: 98.5% Feature:BNC connector, suitable for most pH meter and controller with BNC connector. Suitable for wide range of application: Aquariums, Hydroponics, Laboratory etc. Package List:1 * ph-201 Electrode1*ph power buffer 4.011*ph power buffer 6.86 *Please make